Process and catalyst composition for producing olefin polymers

ABSTRACT

A process for producing a polymer or copolymer of an olefin which comprises polymerizing or copolymerizing at least one olefin with or without a diolefin in the presence of a catalyst composed of (A) a magnesium-containing solid titanium catalyst component containing magnesium, titanium, a halogen and an electron donor as essential ingredients and (B) an organoaluminum compound catalyst component; characterized in that 
     (1) said catalyst further comprises (C) an organic silicon compound catalyst component having an Si--O--C or Si--N--C bond, and 
     (2) said electron donor in the catalyst component (A) is a cyclic mono- or poly-ester such as diethyl furane-3,4-dicarboxylate, di-n-butyl 3,4-dihydro-2H-pyrane-5,6-dicarboxylate, di-isobutyl pyrrole-2,3-dicarboxylic, di-n-butyl thiophene-2,3-dicarboxylate, n-octyl pyrrolidine-2,3-dicarboxylate, and so on.

This is a division of application Ser. No. 07/099,797, filed Sept. 22,1987 now U.S. Pat. No. 4,841,003, which in turn is a division ofapplication Ser. No. 06/783,816, filed Oct. 7, 1985, now U.S. Pat. No.4,725,656, which in turn is a continuation of application Ser. No.06/563,824, filed Dec. 21, 1983, now abandoned.

This invention relates to a process for producing a polymer or copolymerof an olefin which comprises polymerizing or copolymerizing at least oneolefin with or without a diolefin, preferably polymerizing orcopolymerizing at least one olefin containing at least 3 carbon atoms,or copolymerizing the olefin with up to 10 mole % of ethylene and/or adiolefin, in the presence of a catalyst composed of (A) amagnesium-containing solid titanium catalyst component containingmagnesium, titanium, a halogen and an electron donor as essentialingredients and (B) an organoaluminum compound catalyst component.

According to the process of this invention, the duration of thecatalytic activity is excellent, and the polymerization activity orstereospecificity shows superiority. Furthermore, even when the processis applied to the preparation of an olefin polymer or copolymer having ahigh melt index by using a molecular weight controlling agent such ashydrogen, the stereospecificity of the resulting polymer or copolymerdoes not show an appreciable decrease.

Many proposals have been known heretofore about the polymerization orcopolymerization of olefins using a catalyst composed of (A) amagnesium-containing solid titanium catalyst component containingmagnesium, titanium, a halogen and an electron donor as essentialingredients and (B) an organoaluminum compound catalyst component. It isgenerally known that highly stereospecific polymers or copolymers can beproduced with high catalytic activity by polymerizing or copolymerizingalpha-olefins having at least 3 carbon atoms using catalysts of thistype. Many prior attempts have been made to produce themagnesium-containing solid titanium catalyst component (A) by using avariety of reactants, their combinations and means for preparing thiscatalyst component.

It is still desired, however, to improve the activity of the catalystand the stereospecificity of the resulting polymers or copolymers. Forexample, to obtain olefin polymers or copolymers having high qualitywithout the need for an after-treatment operation after thepolymerization, the proportion of a stereospecific polymer or copolymershould be very high, and the yield of the polymer or copolymer per unitweight of the transition metal should be sufficiently high. Theconventional techniques proposed can be said to be on a fairly highlevel with some types of the final polymers or copolymers. However, fewcan be said to exhibit sufficient performance in view of the amount ofhalogen remaining in the final polymers or copolymers which causes thedisadvantage of rust formation on molding machines.

Furthermore, the conventional techniques usually have the defect thatnot a low decrease occurs in yield and stereospecificity in theproduction of polymers having a high melt index.

The present inventors have made investigations in order to provide animproved process for polymerization or copolymerization of olefins whichcan overcome the aforesaid disadvantages or defects. Theseinvestigations have led to the discovery that a process for polymerizingor copolymerizing olefins with an excellent duration of the catalyticactivity and higher polymerization activity or stereospecificity can beprovided by using a catalyst composed of (A) a magnesium-containingsolid titanium catalyst component containing magnesium, titanium, ahalogen and an electron donor as essential ingredients, (B) anorganoaluminum compound catalyst component and (C) an organic siliconcompound catalyst component having an Si--O--C or Si--N--C bond, saidelectron donor forming the magnesium-containing solid titanium catalystcomponent (A) being selected from compounds (a), (b), (c), (d), (e) and(f) described hereinbelow.

It has also been found that when polymers of high melt indices are to beproduced by using the conventional catalyst systems by increasing theamount of a molecular weight controlling agent such as hydrogen, areduction in catalytic activity cannot be avoided, but that the catalystsystem of this invention does not show such a reduction in activity butunexpectedly rather tends to increase in activity.

It is an object of this invention therefore to provide an improvedprocess for polymerizing or copolymerizing olefins, preferablyalpha-olefins having at least 3 carbon atoms.

Another object of this invention is to provide an improved catalyst tobe used in the aforesaid improved process.

The above and other objects and advantages of this invention will becomeapparent from the following description.

According to this invention, there is used a catalyst composed of (A) amagnesium-containing solid titanium catalyst component containingmagnesium, titanium, a halogen and an electron donor as essentialingredients, (B) an organoaluminum compound catalyst component and (C)an organic silicon compound catalyst component having an Si--O--C orSi--N--C bond, the electron donor in component (A) being selected fromthe group consisting of compounds (a), (b), (c), (d), (e) and (f)described below.

(a) A mono- or poly-ester of an unsaturated non-aromatic cyclicpolycarboxylic acid in which R¹ of the ester moiety --COOR¹ is a linearhydrocarbon group, and the non-aromatic ring is a non-heterocyclic ringcomposed of at least one pair of 2 adjacent carbon atoms forming adouble bond and another carbon atom with at least two carboxyl groupsbeing directly or indirectly bonded to the carbon atoms forming thedouble bond.

Preferred esters (a) are those of the following formula ##STR1## whereinR¹⁰ represents a substituted or unsubstituted divalent hydrocarbon grouphaving 1 to 8 carbon atoms, preferably 3 to 5 carbon atoms, morepreferably 4 carbon atoms, R¹¹ represents a substituted or unsubstitutedalkylene group having 1 to 4 carbon atoms, preferably 1 to 3 carbonatoms, more preferably 2 carbon atoms, Q₁ 's may be identical ordifferent and each represents a direct single bond, or a substituted orunsubstituted divalent hydrocarbon group having 1 to 6 carbon atoms,preferably 1 to 2 carbon atoms, which may have a double bond, Q₁ 'sshould not simultaneously contain a double bond, and R¹ 's may beidentical or different and each represents a linear alkyl group having 1to 16 carbon atoms, preferably 2 to 8 carbon atoms.

Examples of the divalent hydrocarbon group R¹⁰ include methylene,ethylene, trimethylene, tetramethylene, hexamethylene, propenylene,butenylene and hexadienylene groups.

Examples of the substituent which the divalent hydrocarbon group R¹⁰ mayhave are C₁ -C₆ alkyl groups, C₆ -C₁₂ cycloalkyl groups, C₆ -C₁₂ arylgroups, C₂ -C₆ alkenyl groups, C₁ -C₆ haloalkyl groups and C₁ -C₆aminoalkyl groups.

Examples of the substituent which R¹¹ may have include are the same asthose given above for R¹⁰.

Examples of the divalent hydrocarbon group Q₁ include methylene,ethylene, trimethylene and propylene groups.

Examples of R¹ include ethyl, propyl, n-butyl and hexyl groups.

Examples of the esters of formula (a-1) or (a-2) above include diethylcyclohexene-1,2-dicarboxylate, di-n-propylcyclohexene-1,2-dicarboxylate, di-n-butyl cyclohexene-1,2-dicarboxylate,di-n-hexyl cyclohexene-1,2-dicarboxylate, di-n-octylcyclohexene-1,2-dicarboxylate, mono-n-butylcyclohexene-1,2-dicarboxylate, di-n-butyl1,3-cyclohexadiene-1,2-dicarboxylate, di-n-octyl1,4-cyclohexadiene-1,2-dicarboxylate, di-n-butylcyclohexene-1,2-diacetate, di-n-butyl 1,4-cyclohexadiene-1,2-diacetateand di-n-butyl 1,3-cyclohexadiene-2,3-dicarboxylate.

(b) A mono- or poly-ester of an unsaturated heterocyclic polycarboxylicacid in which R² of the ester moiety --COOR² is a linear hydrocarbongroup, at least one R² is a linear hydrocarbon group having not lessthan 2 carbon atoms, the heterocyclic ring is an unsaturatedheterocyclic ring composed of at least one pair of two adjacent carbonatoms forming a double bond and an oxygen atom alone as a hetero atomwith at least two carboxyl groups being directly or indirectly bonded tothe carbon atoms forming the double bond.

Preferred esters of (b) are those represented by the following formula##STR2## wherein R¹² represents a substituted or unsubstituted C₁ -C₅,preferably C₂ -C₃, more preferably C₂, divalent hydrocarbon group havingat least one oxygen atom alone as a hetero atom which may have a doublebond, R¹³ represents --O-- or a substituted or unsubstituted group ofthe formula --O.CH₂ -- Q₂ 's may be identical or different and eachrepresents a direct single bond or a substituted or unsubstituteddivalent hydrocarbon group having 1 to 6 carbon atoms which may have adouble bond, Q₂ 's should not simultaneously contain a double bond, andR² 's may be identical or different and each represents a linear alkylgroup having 1 to 16 carbon atoms, provided that at least one of the twoR² 's in each formula is a linear alkyl group having not less than 2carbon atoms.

Examples of the divalent hydrocarbon group R¹² having at least oneoxygen atom alone as a hetero atom include --CH₂ --O--, --CH₂ --O--CH₂--, --O--CH₂ --CH₂ --, --O--CH═CH--, --CH₂ --CH₂ --O--CH₂ -- and--CH═CH--O--CH₂ --. Examples of the substituent which the divalenthydrocarbon group R¹² having at least one oxygen atom may have are C₁-C₆ alkyl groups, C₆ -C₁₂ cycloalkyl groups, C₆ -C₁₂ aryl groups, C₂ -C₆alkenyl groups, C₁ -C₆ haloalkyl groups and C₁ -C₆ aminoalkyl groups.

Examples of the substituent which the group --O.CH₂ --represented by R¹³have are the same as those given above for R¹⁰.

Examples of the divalent hydrocarbon group Q₂ are methylene, ethylene,trimethylene and propylene groups.

Thus, specific examples of the esters of formula (b-1) or (b-2) includediethyl furane-3,4-dicarboxylate, di-n-propyl furane-3,4-dicarboxylate,di-n-butyl furane-3,4-dicarboxylate, di-n-octylfurane-3,4-dicarboxylate, di-n-butyl furane-2,3-dicarboxylate,di-n-octyl 4,5-dihydrofurane-2,3-dicarboxylate, di-n-butyl3,4-dihydro-2H-pyrane-5,6-dicarboxylate and di-n-propylbenzopyrane-3,4-dicarboxylate.

(c) A mono- or poly-ester of an unsaturated heterocyclic polycarboxylicacid in which R³ of the ester moiety --COOR³ is a hydrocarbon group andat least one R³ is a hydrocarbon group having not less than 3 carbonatoms, the heterocyclic ring is an unsaturated heterocyclic ringcomposed of at least one pair of two adjacent carbon atoms forming adouble bond and at least one hetero atom selected from nitrogen andsulfur atoms, with at least two carboxyl groups being directly orindirectly bonded to the carbon atoms forming the double bond.

Preferred esters of (c) are those of the following formula ##STR3##wherein R¹⁴ represents a substituted or unsubstituted C₁ -C₆, preferablyC₂ -C₃, divalent hydrocarbon group which has at least one hetero atomselected from the group consisting of nitrogen and sulfur atoms andwhich may have a double bond, R¹⁵ represents a divalent group which hasat least one hetero atom selected from nitrogen and sulfur atoms and isselected from the group consisting of --S--, --S--CH₂ --, --NH-- and--NH--CH₂ --, Q₃ 's may be identical or different and each represents adirect single bond, or a substituted or unsubstituted C₁ -C₆ divalenthydrocarbon group which may have a double bond, Q₃ 's should notsimultaneously contain a double bond, R₃ 's may be identical ordifferent and each represents a linear or branched alkyl group having 1to 16 carbon atoms, preferably 2 to 8 carbon atoms, and at least one ofthe two R³ in each formula is a linear or branched alkyl group havingnot less than 3 carbon atoms.

Examples of the divalent hydrocarbon group R¹⁴ having at least onehetero atom selected from nitrogen and sulfur atoms include --NH--CH₂--, --NH--CH═CH--, --CH₂ --NH--CH₂ --, --NH--CH --CH₂ --NH--CH₂ --CH₂--, --S--CH₂ --, --S--CH═CH--, --CH₂ --S--CH₂ --, --S--CH₂ -CH₂ --, and--CH₂ --S--CH₂ --CH₂ --.

Examples of the substituent which the divalent hydrocarbon group R¹⁴ mayhave are the same as those given above for R¹⁰.

Examples of the substituent which the divalent group R¹⁵ having at leastone hetero atom may have are the same as those given above for R¹⁰.

Examples of the divalent hydrocarbon group Q₃ are the same as thosegiven above for Q₁.

Specific examples of the esters of formula (c-1) or (c-2) includedi-iso-butyl pyrrole-2,3-dicarboxylate, di-n-propylpyrrole-2,3-dicarboxylate, di-isobutyl pyridine-2,3-dicarboxylate,di-n-hexyl pyridine-3,4-dicarboxylate, di-n-butylthiophene-2,3-dicarboxylate, di-iso-octyl thiophene-3,4-dicarboxylate,di-n-butyl thionaphthene-2,3-dicarboxylate and di-n-propylindole-2,3-dicarboxylate.

(d) A mono- or poly-ester of an unsaturated nonaromatic cyclicpolycarboxylic acid in which R⁴ of the ester moiety --COOR⁴ is ahydrocarbon group, the non-aromatic ring may contain at least one heteroatom selected from oxygen, nitrogen and sulfur atoms in addition to atleast two carbon atoms, and at least two carboxyl groups are bondeddirectly or indirectly to the non-aromatic ring, provided that when atleast one pair of two adjacent carbon atoms forming a double bond existsin the non-aromatic ring, at least one of the carboxyl groups is bondeddirectly or indirectly to a carbon atom other than the above twoadjacent carbon atoms.

Preferred esters of (d) are those of the following formula ##STR4##wherein R¹⁶ represents a substituted or unsubstituted C₂ -C₁₀ divalenthydrocarbon group which has a double bond and may contain at least onehetero atom selected from the group consisting of oxygen, nitrogen andsulfur atoms Q₄ 's may be identical or different and each represents adirect single bond, or a substituted or unsubstituted divalenthydrocarbon group having 1 to 16 carbon atoms , preferably 1 to 2 cabonatoms, which may have a double bond, Q₄ ' should not simultaneouslycontain a double bond, and R⁴ 's may be identical or different and eachrepresents a linear or branched alkyl group having 1 to 16 carbon atoms,preferably 2 to 8 carbon atoms, provided that when R¹⁶ has two adjacentcarbon atoms forming a double bond, at least one group --Q₄ --COOR⁴ isbonded to a carbon atom other than the two adjacent carbon atoms.

Examples of the divalent or trivalent hydrocarbon group R¹⁶ which maycontain at least one hetero atom selected from the group consisting ofoxygen, nitrogen and sulfur atoms include ##STR5##

Examples of the substituent which the divalent or trivalent hydrocarbongroup R¹⁶ may have are the same as those given above for R¹⁰.

Examples of the divalent hydrocarbon group Q₄ are the same groups asexemplified hereinabove for Q₁.

Specific examples of the esters of (d) include diethyl esters,di-iso-propyl esters, di-n-propyl esters, di-n-butyl esters,di-iso-butyl esters, di-secbutyl esters, di-tert-butyl esters,di-n-hexyl esters, di-n-octyl esters, di-2-ethylhexyl esters, di-n-decylesters and mono-iso-butyl esters of dicarboxylic acids such ascyclohexene-1,6-dicarboxylic acid, cyclohexene-3,4-dicarboxylic acid,cyclohexene-4,5-dicarboxylic Nadic acid, Methyl Nadic acid,1-allylcyclohexane-3,4-dicarboxylic acid, 2-pyrroline-4,5-dicarboxylicacid and 4,5-dihydrofurane-4,5-dicarboxylic acid.

As exemplified above, R⁴ is preferably a linear or branched alkyl grouphaving at least 2 carbon atoms.

(e) A mono- or poly-ester of an aromatic polycarboxylic acid in which R⁵of the ester moiety --COOR⁵ is a hydrocarbon group and one carboxylgroup is bonded to each of two adjacent carbon atoms of the aromaticring provided that at least one of the carboxyl groups is bondedindirectly; or a mono- or poly-ester of a polycyclic aromaticpolycarboxylic acid having a fused non-aromatic ring containing asconstituent members two adjacent carbon atoms of the aromatic ring, inwhich R⁵ of the ester moiety --COOR⁵ is a hydrocarbon group and acarboxyl group is bonded directly or indirectly to each of two adjacentcarbon atoms other than said members of the non-aromatic ring.

Preferred esters of (e) are those of the following formula ##STR6##wherein R¹⁷ 's may be identical or different and each represents asingle bond, or a substituted or unsubstituted C₁ -C₆, preferably C₁-C₂, divalent hydrocarbon group which may have a double bond and maycontain at least one hetero atom selected from the group consisting ofoxygen, nitrogen and sulfur atoms, R¹⁷ 's should not simultaneously besingle bonds, R¹⁸ 's may be identical or different and each represents asubstituted or unsubstituted C₁ -C₂ trivalent or tetravalent hydrocarbongroup which may have a double bond and may contain at least one heteroatom selected from the group consisting of oxygen, nitrogen and sulfuratoms, Q₅ 's may be identical or different and each represents a directsingle bond or a divalent hydrocarbon group having 1 to 3 carbon atoms,and R⁵ 's may be identical or different and each represents a linear orbranched alkyl group having 1 to 16 carbon atoms, preferably 2 to 8carbon atoms.

Examples of the divalent hydrocarbon group R¹⁷ which may contain atleast one hetero atom selected from the group consisting of oxygen,nitrogen and sulfur atoms include methylene, ethylene and propylenegroups.

Examples of the trivalent or tetravalent hydrocarbon group R¹⁸ which maycontain at least one hetero atom selected from the group consisting ofoxygen, nitrogen and sulfur atoms include ##STR7##

Examples of the divalent hydrocarbon group Q₅ are methylene, ethyleneand propylene groups.

Specific examples of the esters of formula (e-1) or (e-2) includedi-n-propyl 1,2-benzenediacetate, di-tert-butyl 1,2-benzenediacetate,diethyl 2,3-naphthalenediacetate, di-2-ethylhexylindane-2,3-di-carboxylate, di-n-butyl2,3-dihydrothionaphthene-2,3-dicarboxylate, and di-n-propyl2,3-dihydroindole-2,3-dicarboxylate.

(f) A mono- or poly-ester of a saturated heterocyclic polycarboxylicacid in which R⁶ of the ester moiety --COOR⁶ is a hydrocarbon group, andthe saturated heterocyclic ring is a saturated heterocylic ring composedof at least two adjacent carbon atoms and at least one hetero atomselected from the group consisting of oxygen, nitrogen and sulfur atomswith at least two carboxyl groups being bonded directly or indirectly totwo adjacent carbon atoms of the heterocyclic ring.

Preferred esters of (f) are those of the following formula ##STR8##wherein R¹⁹ represents a divalent saturated hydrocarbon group having 1to 3 carbon atoms , preferably 2 to 3 carbon atoms, and at least onehetero atom selected from the group consisting of oxygen, nitrogen andsulfur atoms, Q₆ 's may be identical or different and each represents adirect single bond or a divalent hydrocarbon group having 1 to 6 carbonatoms, preferably 1 to 2 carbon atoms, and R⁶ 's may be identical ordifferent and each represents a linear or branched alkyl group having 1to 16 carbon atoms, preferably 2 to 8 carbon atoms.

Examples of the divalent saturated hydrocarbon group R¹⁹ having at leastone hetero atom selected from the group consisting of oxygen, nitrogenand sulfur atoms include --M--CH₂ --, --CH₂ --M--CH₂ --, --M--CH₂ --CH₂--, --M--CH₂ --CH , --CH₂ --M--CH and --CH₂ --M--CH₂ --M--(--M--represents --O--, --NH--, or --S--).

Examples of the divalent hydrocarbon groups Q₆ include methylene,ethylene and propylene groups.

Examples of the alkyl group R₆ are the same as those given above for R¹.

Specific examples of esters of (f) include n-butyltetrahydrothiophene-2,3-dicarboxylate, n-octylpyrrolidine-2,3-dicarboxylate and diisobutyltetrahydropyrane-3,4-dicarboxylate.

More preferred esters are those selected from compounds (a), (b), (d)and (e). Esters selected from the group consisting of compounds (a), (b)and (d) are especially preferred.

In the magnesium-containing solid titanium catalyst component (A)containing magnesium, titanium, a halogen and an electron donor asessential ingredients which is used in the present invention, theelectron donor should be selected from the group consisting of thecompounds (a), (b), (c), (d), (e) and (f) described above.

The magnesium-containing solid titanium catalyst component (A) containsa magnesium halide having lower crystallinity than commercial magnesiumhalides. Usually, it has a specific surface area of at least about 3m^(2/) g, preferably about 40 to about 800 m^(2/) g, more preferablyabout 80 to about 400 m^(2/) g, and its composition does notsubstantially change when washed with hexane at room temperature.Preferably, the titanium catalyst component (A) has a halogen/titaniumatomic ratio of from about 5 to about 200, especially from about 5 toabout 100, an electron donor/titanium mole ratio of from about 0.1 toabout 10, especially from about 0.2 to about 6, and a magnesium/titaniumatomic ratio of from about 2 to about 100, especially from about 4 toabout 50. The component (A) may further contain another electron donor,a metal, an element, a functional group, etc.

The titanium catalyst component (A) can be obtained, for example, bycontacting a magnesium compound (or metallic magnesium), an electrondonor and a titanium compound with one another. Optionally, otherreagents such as compounds of silicon, phosphorus and aluminum may befurther used.

Various methods have been known for the production of themagnesium-containing solid titanium catalyst component containingmagnesium, titanium, a halogen and an electron donor. For example, suchmethods are disclosed in Japanese Laid-Open Patent Publications Nos.108385/1975, 126590/1975, 20297/1976, 28189/1976, 64586/1976,92885/1976, 136625/1976, 87489/1977, 100596/1977, 147688/1977,104593/1977, 2580/1978, 40093/1978, 43094/1978, 135102/1980,135103/1980, 811/1981, 11908/1981, and 18606/1981.

The magnesium-containing solid titanium catalyst component (A) used inthis invention may be produced by these known methods except that theelectron donor selected from the compounds (a) to (f) is used.

Several embodiments of the production of the catalyst component (A) areshown below.

(1) A magnesium compound or a complex of a magnesium compound with anelectron donor, either as such or after having been pulverized in thepresence or absence of an electron donor, a pulverization aid, etc., ispre-treated or not pre-treated with an electron donor and/or anorganoaluminum compound or a halogen-containing silicon compound andthen reacted with a titanium compound which is liquid under the reactionconditions. In the above process, the electron donor selected from (a)to (f) described above is used at least once.

(2) A magnesium compound in the liquid state having no reducing abilityis reacted with a liquid titanium compound in the presence of theelectron donor selected from the compounds (a) to (f) described above toprecipitate a solid titanium complex.

(3) The product obtained by the procedure (2) is reacted with a titaniumcompound.

(4) The product obtained by the procedure (1) or (2) is reacted with anelectron donor or titanium compound.

(5) A magnesium compound or a complex of a magnesium compound with anelectron donor is pulverized in the presence of a titanium compound inthe presence or absence of an electron donor, a pulverization aid, etc.,and with or without pre-treatment with an electron donor and/or anorganoaluminum compound or a halogen-containing silicon compound, theresulting solid is treated with a halogen, a halogen-containingcompound, or an aromatic hydrocarbon. In the above procedure, theelectron donor selected from the compounds (a) to (f) described above isused at least once.

(6) Each of the titanium-containing compounds obtained in (1) to (4) istreated with a halogen or a halogen compound.

Preferred preparation procedures are those in which a titanium halide inthe liquid state is used, and those in which a halogenated hydrocarbonis used after or during the use of a titanium compound.

In preparing the magnesium-containing solid titanium catalyst componentcontaining magnesium, titanium, a halogen and an electron donor selectedfrom the group consisting of the esters (a), (b), (c), (d), (e) and (f)in accordance with the aforesaid embodiments, these esters need notalways to be used as such. Instead, compounds convertible to suchesters, such as acid halides or acid anhydrides, may be used andconverted to these esters in situ. These esters may also be used in theform of an adduct or complex with other compounds such as aluminumcompounds, phosphorus compounds and amine compounds.

Both magnesium compounds having reducing ability and magnesium compoundshaving no reducing ability can be used as the magnesium compound for usein the preparation of the magnesium-containing solid titanium catalystcomponent (A).

Examples of the magnesium compounds having reducing ability includemagnesium compounds having a magnesium-carbon bond or amagnesium-hydrogen bond, such as dimethyl magnesium, diethyl magnesium,dipropyl magnesium, dibutyl magnesium, diamyl magnesium, dihexylmagnesium, didecyl magnesium, ethyl magnesium chloride, propyl magnesiumchloride, butyl magnesium chloride, hexyl magnesium chloride, amylmagnesium chloride, butyl ethoxy magnesium, ethyl butyl magnesium andbutyl magnesium hydride. These magnesium compounds may be used, forexample, in the form of a complex with organo-aluminum compounds, etc.,and may be liquid or solid. On the other hand, examples of the magnesiumcompounds having no reducing ability include magnesium halides such asmagnesium chloride, magnesium bromide, magnesium iodide and magnesiumfluoride; alkoxy magnesium halides such as methoxy magnesium chloride,ethoxy magnesium chloride, isopropoxy magnesium chloride, butoxymagnesium chloride and magnesium octoxy chloride; aryloxy magnesiumhalides such as phenoxy magnesium chloride and methylphenoxy magnesiumchloride; alkoxy magnesiums such as ethoxy magnesium, isopropoxymagnesium, butoxy magnesium, n-octoxy magnesium and 2-ethylhexoxymagnesium; aryloxymagnesiums such as phenoxy magnesium anddimethylphenoxy magnesium; and carboxylic acid salts of magnesium suchas magnesium laurate and magnesium stearate. These magnesium compoundshaving no reducing ability may be those derived from the aforesaidmagnesium compounds having reducing ability, or may be those derivedduring the preparation of the catalyst component. The aforesaidmagnesium compounds may be complexes or compounds or mixtures with othermetal compounds. Or they may be mixtures with each other. The magnesiumcompounds having no reducing ability are preferred. Halogen-containingmagnesium compounds are especially preferred, and above all, magnesiumchloride, alkoxy magnesium chlorides and aryloxy magnesium chlorides arepreferred.

Various titanium compounds can be used in preparing the solid titaniumcatalyst component (A) in this invention. Preferred are tetravalenttitanium compounds represented by the formula

    Ti(OR).sub.g X.sub.4-g

wherein R represents a hydrocarbon group, X represents a halogen atom,and 0≦g≦4.

Examples of such titanium compounds include titanium tetrahalides suchas TiCl₄, TiBr₄ and TiI₄, alkoxy titanium trihalides such asTi(OCH₃)Cl₃, Ti(OC₂ H₅)Cl₃, Ti(O n-C₄ H₉)Cl₃, Ti(OC₂ H₅)Br₃ and Ti(Oiso-C₄ H₉)Br₃, alkoxy titanium dihalides such as Ti(OCH₃)₂, Ti(OC₂ H₅)₂Cl₂, Ti(O n-C₄ H₉)₂ Cl₂ and Ti(OC₂ H₅)₂ Br₂, trialkoxy titaniummonohalides such as Ti(OCH₃)₃ Cl, Ti(OC₂ H₅)₃ Cl, Ti(O n-C₄ H₉)₃ Cl andTi(OC₂ h₅)₃ Br, and tetraalkoxy titaniums such as Ti(OCH₃)₄, Ti(OC₂ H₅)₄and Ti(O n-C₄ H₉)₄. Of these, halogen-containing titanium compounds arepreferred, the titanium tetrahalides being especially preferred.Titanium tetrachloride is by far the most preferred. These titaniumcompounds may be used singly or as a mixture, or as diluted in ahydrocarbon or a halogenated hydrocarbon.

The amounts of the titanium compound, the magnesium compound and theelectron donor to be supported, and other optional electron donors suchas alcohols, phenols, monocarboxylic acid esters, silicon compounds andaluminum compounds used in the preparation of the titanium catalystcomponent (A) cannot be set in a general manner because they differdepending upon the method of preparation. For example, about 0.1 to 10moles of the electron donor to be supported and about 0.05 to 1000 molesof the titanium compound may be used per mole of the magnesium compound.

In the present invention, olefins are polymerized or copolymerized inthe presence of a catalyst composed of (A) the magnesium-containingsolid titanium catalyst component containing magnesium, titanium, ahalogen and an electron donor selected from the group consisting of thecompounds (a) to (f) which can be obtained as above, (B) anorganoaluminum compound catalyst component and (C) an organic siliconcompound catalyst component having an Si--O--C or Si--N--C bond.

Illustrative of the component (B) are (I) organoaluminum compoundshaving at least one Al-C bond in the molecule, for example those of thefollowing general formula

    R.sup.1.sub.m Al(OR.sup.2).sub.n H.sub.p X.sub.q

wherein R¹ and R² may be identical or different and each represents ahydrocarbon group, such as a hydrocarbon group having 1 to 15 carbonatoms, preferably 1 to 4 carbon atoms, X represents a halogen atom suchas chloro or bromo, m is a number represented by 0<m≦3, n is a numberrepresented by 0≦n<3, p is a number represented by 0≦p<3 and q is anumber represented by 0≦q<3 provided that m+n+p+q=3,

and (II) complex alkyl compounds of aluminum and metals of Group I ofthe periodic table which are represented by the general formula

    M.sup.1 AlR.sup.1.sub.4

wherein M¹ is Li, Na or K, and R¹ is as defined above. Examples of theorganoaluminum compounds of (I) include compounds of the general formula

    R.sup.1.sub.m Al(OR.sup.2).sub.3-m

wherein R¹ and R² are as defined, and m is

preferably a number represented by 1.5≦m≦3, compounds of the generalformula

    R.sup.1.sub.m AlX.sub.3-m

wherein R¹ is as defined above, X represents a halogen atom, and m ispreferably a number represented by 0<m<3, compounds of the generalformula

    R.sup.1.sub.m AlH.sub.3-m

wherein R¹ is as defined above and m is preferably a number representedby 2≦m<3, and

compounds of the general formula

    R.sup.1.sub.m Al(OR.sup.2).sub.n X.sub.q

wherein R¹ and R² are as defined above, X represents a halogen, 0<m≦3,0≦n<3 and 0≦q<3 provided that m+n+q=3.

Specific examples of the organoaluminum compounds belonging to group (I)include trialkyl aluminums such as triethyl aluminum and tributylaluminum; trialkenyl aluminums such as triisoprenyl aluminum; dialkylaluminum alkoxides such as diethyl aluminum ethoxide and dibutylaluminum butoxide; alkyl aluminum sesquialkoxides such as ethyl aluminumsesquiethoxide and butyl aluminum sesquibutoxide; partially alkoxylatedalkyl aluminums having the average composition R¹ ₂.5 Al(OR²)₀.5 ;dialkyl aluminum halides such as diethyl aluminum chloride, dibutylaluminum chloride and diethyl aluminum bromide; alkyl aluminumsesquihalides such as ethyl aluminum sesquichloride, butyl aluminumsesquichloride and ethyl aluminum sesquibromide; partially halogenatedalkyl aluminums such as ethyl aluminum dichloride, propyl aluminumdichloride and butyl aluminum dibromide; dialkyl aluminum hydrides suchas diethyl aluminum hydride and dibutyl aluminum hydride; partiallyhydrogenated alkyl aluminums such as ethyl aluminum dihydride and propylaluminum dihydride; and partially alkoxylated and halogenated alkylaluminums such as ethyl aluminum ethoxychloride, butyl aluminumbutoxychloride and ethyl aluminum ethoxybromide.

Examples of the compounds belonging to group (II) are LiAl(C₂ H₅)₄ andLiAl(C₇ H₁₅)₄.

Organoaluminum compounds in which two or more aluminums are bondedthrough an oxygen or nitrogen atom, which are similar to the compoundsof group (I), may also be used. Such organoaluminum compounds include,for example, (C₂ H₅)₂ AlOAl(C₂ H₅), (C₄ H₉)₂ AlOAl(C₄ H₉)₂ and ##STR9##

Of these, trialkyl aluminums and alkyl aluminums in which two or morealuminums are bonded are preferred.

The component (C) of the catalyst used in this invention is an organicsilicon compound having an Si--O--C or Si--N--C bond, such asalkoxysilanes and aryloxysilanes. Examples of the organic siliconcompound are given below.

(i) Organosilanes represented by the following formula

    R.sub.n Si(OR.sup.20).sub.4-n

wherein R represents a hydrocarbon group which may have a halogen atomor an amino group, or a halogen atom, R²⁰ represents a hydrocarbon groupwhich may have an alkoxy group, and n is a number represented by 0≦n≦3,provided that when 2 to 4 R or (OR²⁰) groups exist, they may beidentical or different.

In (i) above, examples of the hydrocarbon group R which may have ahalogen atom or an amino group include alkyl groups having 1 to 8 carbonatoms, cycloalkyl groups having 4 to 12 carbon atoms, aryl groups having6 to 12 carbon atoms, alkenyl groups having 2 to 8 carbon atoms,haloalkyl groups having 1 to 8 carbon atoms and aminoalkyl groups having1 to 8 carbon atoms. Examples of the hydrocarbon group R²⁰ which mayhave an alkoxy group include alkyl groups having 1 to 8 carbon atoms,cycloalkyl groups having 4 to 12 carbon atoms, aryl groups having 6 to12 carbon atoms, alkenyl groups having 2 to 8 carbon atoms, andalkoxyalkyl groups such as C₂ -C₁₂ alkyl groups having alkoxy groupswith 1 to 6 carbon atoms.

Other examples are siloxanes having the group OR²⁰ and silyl esters ofcarboxylic acids. Still other examples include compounds in which two ormore silicon atoms are bonded to each other through an oxygen ornitrogen atom.

It is possible to react a silicon compound having no Si--O--C bond witha compound having an O--C bond in advance or at the site ofpolymerization to form a compound having an Si--O--C bond and use it asthe aforesaid organic silicon compound. For example, this can beachieved by a combination of a halogen-containing silane compound havingno Si--O--C bond or a silicon halide with an alkoxy group-containingaluminum compound, an alkoxy group-containing magnesium compound, ametal alcoholate, an alcohol, a formate ester, ethylene oxide, etc. Theorganic silicon compounds may also contain another metal such asaluminum or tin.

(ii) Organic silicon compounds having an Si--N--C bond such as phenyltrisdimethylaminosilane and bis(dimethylamino)diphenylsilane.

Specific examples of the catalyst component (C) includetrimethylmethoxysilane, trimethylethoxysilane, dimethyldimethoxysilane,dimethyldiethoxysilane, diphenyldimethoxysilane,methylphenyldimethoxysilane, diphenyldiethoxysilane,ethyltrimethoxysilane, methyltrimethoxysilane, vinyltrimethoxysilane,phenyltrimethoxysilane, gamma-chloropropyltrimethoxysilane,methyltriethoxysilane, ethyltriethoxysilane, vinyltriethoxysilane,butyltriethoxysilane, phenyltriethoxysilane,gamma-aminopropyltriethoxysilane, chlorotriethoxysilane,ethyltriisopropoxysilane, vinyltributoxysilane, ethyl silicate, butylsilicate, trimethylphenoxysilane, methyltriallyloxysilane,vinyltris(betamethoxyethoxy)silane, vinyltriacetoxysilane,diethyltetraethoxydisiloxane, and phenyldiethoxydiethylaminosilane.

Preferred are compounds of the above formula R_(n) Si(OR²⁰)_(4-n) suchas methyltrimethoxysilane, phenyltrimethoxysilane,methyltriethoxysilane, ethyltriethoxysilane, vinyltriethoxysilane,phenyltriethoxysilane, vinyltributoxysilane, ethyl silicate,diphenyldimethoxysilane, diphenyldiethoxysilane andmethylphenylmethoxysilane. The component (C) may be used as an adductwith another compound.

In the process of this invention, at least one olefin with or without adiolefin is polymerized or copolymerized in the presence of a catalystcomposed of (A) the magnesium-containing solid titanium catalystcomponent containing magnesium, titanium, a halogen and an electrondonor selected from the group consisting of the esters (a), (b), (c),(d), (e) and (f) as essential ingredients, (B) the organoaluminumcompound catalyst component and (C) the organic silicon compoundcatalyst component having an Si--O--C or Si--N--C bond.

The catalyst components (A), (B) and (C) may be contacted during orbefore the polymerization. Before the polymerization, any two of thesemay be chosen and contacted and then with the remaining one component.Alternatively, portions of two or three components are first contactedwith each other and then with the remainder. Contacting of theindividual components before the polymerization may be carried out in aninert gaseous atmosphere or in an olefin atmosphere. Furthermore, afterthe above contacting before the polymerization, the catalysts component(B) and/or (C) may be partly or wholly removed, and the remainder may beused for the polymerization. When the catalyst component (C) is used atthe time of contacting, a fresh supply of the catalyst component (C)may, or may not, be added during the polymerization.

Olefins having 2 to 8 carbon atoms, such as ethylene, propylene,1-butene, 4-methyl-1-pentene and 1-octene, may, for example, be used inthe polymerization. They may be homopolymerized or copolymerized. In thecopolymerization process, a polyunsaturated compound such as aconjugated or nonconjugated diene may be selected as a comonomer.

The process of this invention is particularly suitable for thepolymerization or copolymerization of alpha-olefins having at least 3carbon atoms, and can be conveniently applied to the polymerization orcopolymerization of at least one olefin containing at least 3 carbonatoms, or the copolymerization of the olefin with up to 10 mole % ofethylene and/or a diolefin.

The polymerization can be carried out either in the liquid or vaporphase. In the case of the liquid-phase polymerization, an inert solventsuch as hexane, heptane or kerosene may be used as a reaction solvent,but the olefin itself may be used as a reaction solvent.

The mode of polymerization may be properly chosen, and any of abatchwise method, a semi-continuous method and a continuous method canbe used. It is also possible to perform the polymerization in amultiplicity of stages having different reaction conditions.

The amount of the catalyst can be properly selected. Preferably, perliter of the reaction volume (which denotes the volume of a vapor-phasepolymerization reaction system in the case of vapor-phasepolymerization, and the volume of a reaction liquid medium in the caseof liquid-phase polymerization), the amount of the component (A)calculated as titanium atom is, for example, about 0.0001 to about 1millimole; the amount of the component (B) is such that the proportionof the Al atom in component (B) is , for example, about 1 to about 2,000moles, preferably about 5 to about 500 moles, per mole of the titaniumatom in component (A); and the amount of the component (C) is such thatthe proportion of the Si atom in component (C) is, for example, about0.001 to about 10 moles, preferably about 0.01 to about 2 moles,especially preferably about 0.05 to about 1 mole, per mole of the Alatom in component (B).

The polymerization temperature is, for example, about 20 to about 200°C., preferably about 50 to about 180° C., and the polymerizationpressure is, for example, from atmospheric pressure to about 100 kg/cm²,preferably about 2 to about 50 kg/cm².

When the process of this invention is applied to the stereospecificpolymerization of alpha-olefins having at least 3 carbon atoms, polymershaving a high stereospecific index can be produced with a high catalyticefficiency.

In the polymerization of olefins with previously proposedmagnesium-containing solid titanium catalyst components, an attempt toobtain polymers having a high melt index by using hydrogen results in atendency toward not a small decrease in stereospecificity. The processof the present invention can reduce this tendency. Furthermore, sincethe catalyst used in this invention has high activity, the amount ofpolymer yielded per unit weight of the solid titanium catalyst componentis larger than in the case of using the conventional catalysts, whenpolymers having the same stereospecific index are to be obtained.Accordingly, the amount of the catalyst residue, particularly halogen,in the polymer can be reduced. This, of course, enables a catalystremoving operation to be omitted, and the tendency of molds to form rustduring the molding operation can be markedly inhibited.

Furthermore, the melt index of the polymer can be changed by using alesser amount of a molecular weight controlling agent such as hydrogenthan in the case of the conventional catalyst systems. It is surprisingto note that by increasing the amount of the molecular-weightcontrolling agent, the activity of the catalyst system rather tends toincrease. This characteristic is absent in the conventional catalystsystems. With the conventional catalyst systems, the increasing of theamount of the molecular weight controlling agent for preparation ofpolymers having a high melt index causes a decrease in the partialpressure of the olefin monomer and necessarily results in a reduction inthe activity of the catalyst. The catalyst system of this invention isquite free from these problems, and its activity rather increases.

The conventional catalyst systems decrease in activity with the passageof the polymerization time. This is scarcely observed in the catalystsystem of this invention, and the use of the catalyst of this inventionleads to a marked increase in the amount of polymers produced in, forexample, a multi-stage continuous polymerization process.

Since the catalyst system of this invention is very stable even at hightemperatures, no appreciable decrease in stereospecificity is noted evenwhen, for example, propylene is polymerized at 90° C.

The following Examples illustrate the present invention morespecifically.

EXAMPLE 1 Preparation of a Solid Catalyst Component (A)

Twenty grams of anhydrous magnesium chloride, 11.9 ml (25 mmoles) ofdiisodecyl cyclohexene-4,5-dicarboxylate, 3.3 ml of titaniumtetrachloride and 3.0 ml of a silicone oil (TSS-451, a tradename for aproduct of Shin-etsu Chemical Co., Ltd.; 20 cs) as a pulverization aidwere fed under a nitrogen atmosphere into a stainless steel (SUS-32)ball mill having an inner volume of 800 ml and an inside diameter of 100mm and containing 2.8 kg of stainless steel (SUS-32) balls with adiameter of 15 mm, and contacted for 24 hours at an impact accelerationof 7G. Fifteen grams of the resulting co-pulverized product wassuspended in 150 ml of 1,2-dichloroethane, and stirred at 80° C. for 2hours. The solid portion was collected by filtration, and washedthoroughly with purified hexane until no free 1,2-dichloroethane wasdetected in the washings. The washed solid was dried to form a catalystcomponent (A) which contained 1.7% by weight of titanium atom, 54% byweight of chlorine atom and 18% by weight of magnesium atom.

Polymerization of Propylene

A 2-liter autoclave was charged with 750 ml of purified hexane, andunder a propylene atmosphere at room temperature, 2.51 mmoles oftriethyl aluminum, 0.25 mmole of diphenyldimethoxysilane and 0.015mmole, as titanium atom, of the catalyst component (A) were fed into theautoclave. Hydrogen (200 ml) was introduced, and the temperature wasraised to 70° C. Propylene was polymerized for 4 hours. During thepolymerization, the pressure of the inside of the autoclave wasmaintained at 7 kg/cm² G.

After the polymerization, the slurry containing the resulting polymerwas filtered to separate it into a white powdery polymer and a liquidphase. After drying, the amount of the white powdery polymer obtainedwas 278.6 g. It had a boiling n-heptane extraction residue of 97.5%, amelt index of 2.0 and an apparent density of 0.40 g/ml. Concentratingthe liquid phase gave 2.9 g of a solvent-soluble polymer. Hence, theactivity was 18,800 g-PP/mmole-Ti, and the total isotacticity (II) was96.6%.

EXAMPLES 2 to 10 Preparation of a Solid Catalyst Component (A)

In each run, a solid catalyst component (A) was prepared in the same wayas in Example 1 except that each of the compounds shown in Table 1 wasused in the indicated amount instead of 11.9 ml (25 mmoles) ofdiisodecyl cyclohexene-4,5-dicarboxylate used in Example 1.

The composition of each catalyst is shown in Table 1.

Polymerization of Propylene

Using the catalyst component (A) obtained above, propylene waspolymerized in the same way as in Example 1. The results are shown inTable 1.

EXAMPLE 11 Preparation of a Solid Catalyst Component (A)

Twenty grams of anhydrous magnesium chloride, 11.9 ml (25 mmoles) ofdi-iso-decyl cyclohexene-4,5-dicarboxylate and 3.0 ml of a silicone oil(TSS-451, a tradename for a product of Shin-etsu Chemical Co., Ltd.; 20cs) as a pulverization aid were fed under a nitrogen atmosphere into astainless steel (SUS-32) ball mill having an inner volume of 800 ml andan inside diameter of 100 mm and containing 2.8 kg of stainless steel(SUS-32) ball mills with a diameter of 15 mm, and contacted for 24 hoursat an impact acceleration of 7G. Fifteen grams of the resultingco-pulverized product was suspended in 150 ml of titanium tetrachloride,and stirred at 80° C. for 2 hours. The solid portion was collected byfiltration, and thoroughly washed with purified hexane until no freetitanium compound was detected in the washings. The washed solid wasthen dried to give a catalyst component (A) containing 2.9% by weight oftitanium atom, 56% by weight of chlorine atom and 18% by weight ofmagnesium atom.

Polymerization of Propylene

Using the catalyst component (A) prepared above, propylene waspolymerized in the same way as in Example 1.

EXAMPLE 12

Preparation of a Solid Catalyst Component (A)

A solid catalyst component (A) was prepared in the same way as inExample 1 except that 10.3 ml (25 mmoles) of di-n-octylcyclohexene-4,5-dicarboxylate was used instead of 11.9 ml (25 mmoles) ofdi-iso-decyl cyclohexene-4,5-dicarboxylate. The composition of theresulting catalyst is shown in Table 1.

Polymerization of Propylene

Using the solid catalyst component (A) prepared above, propylene waspolymerized in the same way as in Example 1. The results are shown inTable 1.

EXAMPLE 13

A 2-liter high-speed stirring apparatus (a product of Tokushu Kika KogyoK.K.) was fully purged with N₂ gas, and charged with 700 ml of purifiedkerosene, 10 g of commercially available MgCl₂, 24.2 g of ethanol and 3g of sorbitan distearate (Emasol 320, a tradename for a product ofKao-Atlas Co., Ltd.). With stirring, the temperature of the system wasraised, and the mixture was stirred at 120 ° C. and 800 rpm for 30minutes. With high-speed stirring, the resulting suspension under highspeed stirring was transferred by means of a Teflon tube having aninside diameter of 5 mm into a 2-liter glass flask (equipped with astirrer) in which 1 liter of purified kerosene cooled at -10° C. hadbeen put. The resulting solid was collected by filtration, and washedfully with hexane to obtain a carrier.

The resulting carrier (7.5 g) was suspended in 150 ml of titaniumtetrachloride, and then 3.3 ml of di-n-octylcyclohexene-4,5-dicarboxylate was added. The mixture was stirred at 120°C. The solid portion was collected by filtration and again suspended in150 ml of titanium tetrachloride, and the suspension was stirred at 130°C. for 2 hours. The solid reaction product was collected by filtrationfrom the reaction mixture, and washed with a sufficient amount ofpurified hexane to give a solid catalyst component (A) containing 2.8%by weight of titanium atom, 60.0% by weight of chlorine atom and 19.0%by weight of magnesium atom.

Polymerization of Propylene

Using the solid catalyst component (A) prepared above, propylene waspolymerized in the same way as in Example 1. The results are shown inTable 1.

                                      TABLE 1                                     __________________________________________________________________________                                Result of the polymerization                      Catalyst                             Melt                                                          Catalyst                                                                             Activity flow                                                                              Apparent                                             Amount                                                                             composition                                                                          (g-PP/                                                                             Total                                                                             rate                                                                              bulk                                 Ex-             added                                                                              (wt. %)                                                                              mmole-                                                                             II  (g/10                                                                             density                              ample                                                                             Electron donor                                                                            (mmoles)                                                                           Ti                                                                              Cl                                                                              Mg Ti)  (%) min.)                                                                             (g/ml)                               __________________________________________________________________________    2   Di-n-octyl cyclohexene-                                                                   25   1.8                                                                             53                                                                              17 14,700                                                                             95.1                                                                              4.3 0.38                                     4,5-dicarboxylate                                                         3   D-2-ethylhexyl cyclo-                                                                     30   1.9                                                                             52                                                                              16 13,900                                                                             94.6                                                                              9.0 0.39                                     hexene-4,5-dicarboxylate                                                  4   Diethyl furane-3,4-                                                                       30   1.9                                                                             59                                                                              16  7,900                                                                             93.7                                                                              11.0                                                                              0.34                                     dicarboxylate                                                             5   Di-n-butyl cyclohexene-                                                                   30   1.9                                                                             58                                                                              17 13,300                                                                             94.4                                                                              7.3 0.38                                     1,2-dicarboxylate                                                         6   Diethyl cyclohexene-1,2-                                                                  30   2.1                                                                             54                                                                              19 13,900                                                                             92.9                                                                              6.4 0.37                                     dicarboxylate                                                             7   Dibutyl     30   1.8                                                                             54                                                                              16 16,200                                                                             93.1                                                                              5.5 0.37                                 8   Di-iso-butylpyridine-                                                                     30   2.4                                                                             59                                                                              16  6,900                                                                             91.2                                                                              6.3 0.34                                     2,3-dicarboxylate                                                         9   Di-2-ethylhexyl indane-                                                                   30   2.9                                                                             61                                                                              20  7,100                                                                             90.6                                                                              10.5                                                                              0.30                                     2,3-dicarboxylate                                                         10  Di-n-octyl pyrrolidine-                                                                   30   1.9                                                                             58                                                                              17  6,200                                                                             92.1                                                                              5.5 0.33                                     2,3-dicarboxylate                                                         11  Di-iso-decyl cyclo-                                                                       25   2.9                                                                             56                                                                              18 16,800                                                                             92.4                                                                              3.8 0.36                                     hexene-4,5-dicarboxylate                                                  12  Di-n-octyl cyclohexene-                                                                   25   2.4                                                                             59                                                                              20 15,000                                                                             94.2                                                                              5.8 0.37                                     4,5-dicarboxylate                                                         13  Di-n-octyl cyclohexene-                                                                   8    2.8                                                                             60                                                                              19 19,300                                                                             95.1                                                                              1.9 0.39                                     4,5-dicarboxylate                                                         __________________________________________________________________________

What is claimed is:
 1. In a process for producing a polymer or copolymerof an olefin which comprises polymerizing or copolymerizing at least oneolefin with or without a diolefin in the presence of a catalystcomprising (A) a magnesium-containing solid titanium catalyst componentcontaining magnesium, titanium, a halogen and an electron donor asessential ingredients and (B) an organoaluminum compound catalystcomponent; the improvement wherein(1) said catalyst further comprises(C) an organic silicon compound catalyst component having an Si--o--c orSi--N--c bond, and (2) said electron donor in the catalyst component (A)is selected from the group consisting of (b), (c) and (f) below: (b) adiester of an unsaturated heterocyclic polycarboxylic acid in which theheterocyclic ring is an unsaturated heterocyclic ring composed of atleast one pair of two adjacent carbon atoms forming a double bond and anoxygen atom along as a hetero atom with at least two carboxyl groupsbeing directly or indirectly bonded to the carbon atoms forming thedouble bond, said diester being a compound of the following formula##STR10## wherein R¹² represents a substituted or unsubstituted C₁ -C₅divalent hydrocarbon group having at least one oxygen atom alone as ahetero atom which may have a double bond, Q₂ 's may be identical ordifferent and each represents a direct single bond or a substituted orunsubstituted divalent hydrocarbon group having 1 to 6 carbon atomswhich may have a double bond, Q₂ 's should not simultaneously contain adouble bond, and R² 's may be identical or different and each representsa linear alkyl group having 1 to 16 carbon atoms, provided that at leastone of the two R² 's is a linear alkyl group having not less than 2carbon atoms, (c) a diester of an unsaturated heterocyclicpolycarboxylic acid of the following formula ##STR11## wherein R¹⁴represents a substituted or unsubstituted C₁ -C₆ divalent hydrocarbongroup which has at least one hetero atom selected from the groupconsisting of nitrogen and sulfur atoms and which may have a doublebond, Q₃ 's may be identical or different and each represents a directsingle bond or a substituted or unsubstituted C₁ -C₆ divalenthydrocarbon group which may have a double bond, Q₃ 's do notsimultaneously contain a double bond, R³ 's may be identical ordifferent and each represents a linear or branched alkyl group having 1to 16 carbon atoms, and at least one of the two R³ 's is a linear orbranched alkyl group having not less than 3 carbon atoms, and (f) amono- or poly-ester of a saturated heterocyclic polycarboxylic acid inwhich R⁶ of the ester moiety --COOR⁶ is a hydrocarbon group, and thesaturated heterocyclic ring is a saturated heterocyclic ring composed ofat least two adjacent carbon atoms and at least one hetero atom selectedfrom the group consisting of oxygen, nitrogen and sulfur atoms with atleast two carboxyl group being bonded directly or indirectly to twoadjacent carbon atoms of the heterocyclic ring.
 2. The process of claim1 wherein the organic silicon compound catalyst component (C) is anorganosilane represented by the following formula

    R.sub.n Si(OR.sup.20).sub.4-n

wherein R represents a hydrocarbon group which may have a halogen atomsor an amino group, or a halogen atom, R²⁰ represents a hydrocarbon groupwhich may have an alkoxy group, and n is a number represented by 0≦n≦3,provided that when 2 to 4 R or (OR²⁰) groups exist, they may beidentical or different.
 3. The process of claim 1 wherein the electrondonor in the catalyst component (A) is ##STR12## a diester of asaturated heterocyclic polycarboxylic acid of the following formula##STR13## wherein R¹⁹ represents a divalent saturated hydrocarbon grouphaving 1 to 3 carbon atoms and at least one heteroatom selected from thegroup consisting of oxygen, nitrogen and sulfur atoms, Q₆ 's may beidentical or different and each represents a direct single bond or adivalent hydrocarbon group having 1 to 6 carbon atoms, and R⁶ 's may beidentical or different and each represents a linear or branched alkylgroup having 1 to 16 carbon atoms.
 4. The process of claim 1 wherein thepolymerization or copolymerization is carried out under such conditionsthat per liter of the reaction volume, the amount of the solid titaniumcatalyst component (A) is about 0.0001 to about 1 millimoles as the Tiatom; the amount of the organoaluminum compound (B) is such that theproportion of the Al atom in component (B) is about 1 to about 2,000moles per mole of Ti atom in component (A); and the amount of theorganic silicon compound (C) is such that the proportion of the Si atomin component (C) is about 0.001 to about 10 moles per mole of the Alatom in component (B).
 5. The process of claim 1 wherein thepolymerization or copolymerization is carried out at a temperature ofabout 20 to about 200° C. and a pressure of from atmospheric pressure toabout 100 kg/cm².
 6. The process of claim 1 wherein the organoaluminumcompound catalyst component (B) is a compound selected from the groupconsisting of compounds represented by the general formula

    R.sup.1.sub.m Al(OR.sup.2).sub.n H.sub.p X.sub.q

wherein R¹ and R² may be identical or different and each represents ahydrocarbon group, X represents a halogen atom, m is a numberrepresented by 0<m≦3, n is a number represented by 0≦q<3 and q is anumber represented by 0q≦3 provided that m+n+p+q=3,and compoundsrepresented by the general formula

    M.sup.1 AlR.sup.1.sub.4

wherein M¹ is an atom selected from the group consisting of Li, Na andK, and R¹ is as defined above.
 7. The process of claim 2 wherein in theformula for the organosilane R is selected from the group consisting ofalkyl groups having 1 to 8 carbon atoms, cycloalkyl groups having 4 to12 carbon atoms, aryl groups having 6 to 12 carbon atoms, alkenyl groupshaving 2 to 8 carbon atoms, haloalkyl groups having 1 to 8 carbon atomsand amino alkyl groups having 1 to 8 carbon atoms, or a halogen atom,R²⁰ represents a hydrocarbon group which may have an alkoxy group and isselected from the group consisting of alkyl groups having 1 to 8 carbonatoms, cycloalkyl groups having 4 to 12 carbon atoms, aryl groups having6 to 12 carbon atoms, alkenyl groups having 2 to 8 carbon atoms, andalkoxy alkyl groups having 2 to 12 carbon atoms in the alkyl groups and1 to 6 carbon atoms in the alkoxy groups, and n is a number representedby 0≦n≦3, provided that when 2 to 4 R or (OR²⁰) groups exist, they maybe identical or different.
 8. The process of claim 1 for thepolymerization or copolymerization of an alpha-olefin having at least 3carbon atoms or the copolymerization of said alpha-olefin with up to 10mole % of ethylene, a diolefin or mixtures thereof.
 9. The process ofclaim 1 wherein the electron donor in the catalyst component (A) is saidester of formula (b-1).
 10. The process of claim 9 wherein the electrondonor of formula (b-1) is selected from the group consisting ofdi-n-octyl 4,5-dihydrofurane-2,3-dicarboxylate, di-n-butyl3,4-dihydro-2H-pyrane-5,6-dicarboxylate and di-n-propylbenzopyrane-3,4-dicarboxylate.
 11. The process of claim 3 wherein theelectron donor in the catalyst component (A) is the diester of formula(c-1).
 12. The process of claim 11 wherein the diester of formula (c-1)is selected from the group consisting of di-iso-butylpyridine-2,3-dicarboxylate, di-n-hexyl pyridine-3,4-dicarboxylate,di-n-butyl thionaphthene-2,3-dicarboxylate and di-n-propylindole-2,3-dicarboxylate.
 13. The process of claim 3 wherein theelectron donor in the catalyst component (A) is the diester of formula(f).
 14. The process of claim 13 wherein the diester of formula (f) isselected from the group consisting of n-butyltetrahydrothiophene-2,3-dicarboxylate, n-octylpyrrolidine-2,3-dicarboxylate and diisobutyltetrahydropyrane-3,4-dicarboxylate.
 15. A catalyst composition forproducing a polymer or copolymer of an olefin, said catalystcomprising(A) a magnesium-containing solid titanium catalyst componentcontaining magnesium, titanium, a halogen and an electron donor, (B) anorganoaluminum compound catalyst component, and (C) an organic siliconcompound catalyst component having an Si--O--C or Si--N--C bond; saidelectron donor in the catalyst component (A) being selected from thegroup consisting of (b) a diester of an unsaturated heterocyclicpolycarboxylic acid in which the heterocyclic ring is an unsaturatedheterocyclic ring composed of at least one pair of two adjacent carbonatoms forming a double bond and an oxygen atom alone as a hetero atomwith at least two carboxyl groups being directly or indirectly bonded tothe carbon atoms forming the double bond, said diester being a compoundof the following formula ##STR14## wherein R¹² represents a substitutedor unsubstituted C₁ -C₅ divalent hydrocarbon group having at least oneoxygen atom alone as a hetero atom which may ave a double bond, Q₂ 'smay be identical or different and each represents a direct single bondor a substituted or unsubstituted divalent hydrocarbon group having 1 to6 carbon atoms which may have a double bond, Q₂ +s do not simultaneouslycontain a double bond, and R² 's may be identical or different and eachrepresents a linear alkyl group having 1 to 16 carbon atoms, providedthat at least one of the two R² 's is a linear alkyl group having notless than 2 carbon atoms, (c) a diester of an unsaturated heterocyclicpolycarboxylic acid of the following formula ##STR15## wherein R¹⁴represents a substituted or unsubstituted C₁ -C₆ divalent hydrocarbongroup which has at least one hetero atom selected from the groupconsisting of nitrogen and sulfur atoms and which may have a doublebond, Q₃ 's may be identical or different and each represents a directsingle bond or a substituted or unsubstituted C₁ -C₆ divalenthydrocarbon group which may have a double bond, Q₃ 's do notsimultaneously contain a double bond R³ 's may be identical or differentand each represents a linear or branched alkyl group having 1 to 16carbon atoms, and at least one of the two R³ 's is a linear or branchedalkyl group having not less than 3 carbon atoms, and (f) a mono- orpoly-ester of a saturated heterocyclic polycarboxylic acid in which R⁶of the ester moiety --COOR⁶ is a hydrocarbon group, and the saturatedheterocyclic ring is a saturated heterocyclic ring composed of at leasttwo adjacent carbon atoms and at least one hetero atom selected from thegroup consisting of oxygen, nitrogen and sulfur atoms with at least twocarboxyl groups being bonded directly or indirectly to two adjacentcarbon atoms of the heterocyclic ring.